Only Human: Book Two in the Missing Link Trilogy

Christie and his friends continue their search for the missing link in the faraway Himalayas, where the answers may be found with the elusive and mysterious Yeti.
Their journey leaves Danny battling his overwhelming longing for the sea, and Danny's half-sister Sandy fighting for her father's approval. The experience will bring out the best and worst in the group and eventually compel each of them to ask the ultimate question: What does it mean to be human?